physics

• Measurement


  The assignment of numerical value to objects' physical properties
• Dimension


  Relates the size of a magnitude of property to a numerical suit (mer) of measurement
• Fundamental Quantities


  Basic quantities that are independent from one another
• FIQ Units


  Units corresponding to fundamental quantities, called base units
• Derived Quantities


  Quantities resulting from combinations of any of the fundamental quantities
• Unit conversion examples using meters
• The value of different fundamental and derived quantities is sometimes composed of very large or small numbers
• When we want to quantify or numerically describe the property of an event, a property of an object or characteristics of an object, we can do it by counting or by using instruments to measure
• Measurement


  The process of assignment of numerical value to an object's physical properties
• Physical quantity


  Any number that describes a physical property, consisting of a number and corresponding units
• Seven fundamental quantities

  • Length
  • Mass
  • Time
  • Temperature
  • Electric current
  • Luminous intensity
  • Amount of substance
• Fundamental units/Base units


  Units that can only be defined by the way they were measured, not derived from other units
• Derived units/Derived quantities


  Units defined by describing how they were calculated from other quantities, whether fundamental or derived
• The two most widely used systems of measurement are the metric system (SI units) and the English system (FPS system)
• Most countries around the world use the metric system as the basis for their standard unit of measurement
• The metric system is easier to convert between units as the conversion factors are multiples of 10, unlike the irregular conversion factors in the English system
• Using the same unit of measurement is important for accuracy and reproducibility of experimental results
• Dimensional analysis


  The process of using units to convert from one unit to another
• Larger physical quantity units of the same physical quantities for English systems unlike metric systems where you just need to recall that you need to multiply it by 10 raised to a certain degree so multiples of 10
• The main reason why most countries change from using English system to metric systems is to secure accuracy and reproducibility or precision in the result of our measurements and experiments
• Dimensional analysis


  1. Identify the value to be converted

  2. Find the conversion factor

  3. Multiply the original value by the conversion factor

  4. Write the equivalent value
• Conversion factor


  Numerical fraction or ratio between quantities which can be used as a multiplication factor for converting one unit to another
• Common conversion factors

  • Length
  • Mass
  • Time
  • Speed
  • Force
  • Other derived and fundamental quantities
• Prefixes

  Used to describe the exponential factor in unit conversion
• Metric system has conversion factors in multiples of 10, unlike irregular English system
• Can convert between metric units and English units using conversion factors
• Sometimes only part of the unit needs to be converted, e.g. converting 10 miles per hour to km/h
• To convert 10 miles/h to km/h, only need to convert miles to km using conversion factor of 1 mile = 1.609 km
• 10 miles/h = 16.09 km/h (rounded to 2 sig figs)
• don't need to convert but litto we need to convert miles to kilometers so there are problems where in the bythology only part of the of the whole unit so in this um type of situation so modeling them so i just identify again your conversion factor needed
• Conversion factor


  The ratio that allows you to convert one unit to another
• In one mile there are 1.609 kilometers
• Converting miles to kilometers

  Multiply miles by 1.609 to get kilometers
• 10 miles per hour is equal to 16.09 kilometers per hour
• To express the result in the correct number of significant figures, you need to round it off
• Converting kilometers per hour to meters per second

  1. Write the original value with unit

  2. Convert kilometers to meters (1 km = 1000 m)

  3. Convert hours to seconds (1 hr = 3600 s)

  4. Perform the calculation
• 55 kilometers per hour is equal to 15 meters per second
• Converting yards per second to meters per second

  1. Write the original value with unit

  2. Convert yards to meters (1 yard = 0.9144 m)

  3. Perform the calculation
• Converting meters to feet

  1. Write the original value with unit

  2. Convert meters to feet (1 m = 3.281 ft)

  3. Perform the calculation
• Dimensional analysis is the process of using units and dimensions to solve problems